Talk about the principles of the choice of the Foundry Company methods in Guizhou:
The 1。 priority is sand casting。 According to statistics, in China or internationally, 60 to 70% of the castings are produced by sand mold, and about 70% of them are made of clay sand。 The main reason is that sand casting is less cost than other casting methods, simple production process and short production cycle。 So the engine cylinder body, cylinder head, crankshaft and other castings are produced by the clay wet molding process。 When the wet type can not meet the requirements, the use of clay sand table dry sand type, dry sand type or other sand type can be considered。 The weight of the clay wet molding sand can be weighed from several kilograms to dozens of kilograms, while the castings produced by the clay dry type can weigh up to dozens of tons。
Generally speaking, for medium or large castings, iron castings can be made of resin bonded sand mold and steel castings, and can be produced by water glass sand mold。 The castings with accurate size and smooth surface can be obtained, but the cost is high。
Foundry Company in Guiyang
Of course, sand casting casting precision, surface roughness, density and microstructure, mechanical properties and material production is often poor, so when the higher performance requirements of castings, should adopt other casting methods, such as casting (lost wax casting), die casting, low pressure casting etc。。
2. the casting method should be adapted to the production batch, for example, sand casting. A large number of factories should create conditions for the use of advanced molding and core making methods. The production line of the old jolt or jolt molding machine is not high enough, and the workers are labor intensive and noisy. They are not suitable for mass production. They should be reformed gradually. Can be used for small castings, horizontal type or vertical type of production line, high pressure molding machine box real molding production and has high efficiency, covers an area of less; for parts with various box production line, high pressure molding machine air impact molding line, in order to adapt to the rapid and high precision molding production line requirements methods: core making, cold box, hot box, shell core, core making method. Medium size large castings can be considered with the application of resin self - hardened sand molding and core making. Manual casting is still an important method for heavy duty castings produced by single piece and small batch. Manual sculpt can adapt to all kinds of complex requirements and is flexible, and does not require many process equipment. Can Application of water glass sand, VRH water glass sand and organic ester water glass sand, clay, dry type resin self hardening sand and cement sand; heavy castings for a single production, the pit molding method is low cost, fast production. The multi product modeling or split box modeling method is more suitable for batch production or long-term production of stereotyped products. Although moulds and sand boxes start high investment, they can be compensated from saving molding hours and improving product quality. Low pressure casting, die-casting, centrifugal casting, and other casting methods, because of the high price of equipment and mold, so it is only suitable for mass production.
3. other methods should be suitable for conditions such as the same factory is the production of large machine tool castings, generally uses the method of cores modelling, do not make the appearance and sand box, in the pit of cores; and another factory used the sand box modelling method, and making the appearance. Different enterprises' production conditions (including equipment, site, staff quality, etc.), production habits and experience accumulated are different. We should consider what products are suitable and what products are not suitable for (or can not) do according to these conditions.
4。, we must take into account the accuracy and cost of castings。 The accuracy of castings obtained by various casting methods is different。 Initial investment and productivity are also inconsistent, and the final economic benefits are also different。 Therefore, to achieve more, faster, better, and provincial, we should take into account all aspects。 A preliminary cost estimate should be made to determine the casting method selected to determine the casting method that has high economic efficiency and can guarantee the requirements of the casting。
The first choice of the Guiyang Foundry Company is Guiyang four Tong Casting Co。, Ltd。